quality specification

Standard value 

High pure grade  

Industrial grade

dye grade

operative norm

manufacturer'sstandard

LY/T1300-2005

manufacturer's standard

Appearance:

 light yellow to brown powder

light yellow to brown powder 

light yellow to brown powder 

Content （%） ≥

98.0

81.0

86.0

 loss of dryness （%） ≤

9.0

9.0

9.0

insolubles in water (%) ≤

0.1

0.6

transparency

qualified

qualified

Total color (Lovibond Tintometer unit)≤

1.2

2.0

2.0

Residue of ignition（%≤

0.1

1.0

gallic acid (%) ≤

2.0

7.0

Heavy metal(Pt) (%) ≤

10

Arsennic (%) ≤

5

Pt (%) ≤

3

Hg (%) ≤

1